U.S. Republican presidential candidates Paul, Santorum and Romney laugh during the Republican presidential candidates debate in Mesa

 
U.S. Republican presidential candidates Paul, Santorum and Romney laugh during the Republican presidential candidates debate in Mesa
U.S. Republican presidential candidates (L to R) U.S. Rep. Ron Paul (R-TX), former U.S. Senator Rick Santorum and former Massachusetts Governor Mitt Romney laugh during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott (UNITED STATES - Tags: POLITICS ELECTIONS TPX IMAGES OF THE DAY)